Sunken Lesson Animals with Backbones Grade 3 Fish • Live in water • Most have scales and fins • Use their fins to move through the water • Use gills to breathe Amphibians • Hatch from eggs laid in water • When young, they look like fish and have gills like fish. • They grow legs. • Gills are replaced by lungs. • They can live on land when older. • They can stay underwater for a long time. • Frogs, toads, salamanders, and newts are examples. Reptiles • Have scales • Lay eggs with leathery shells • Most live all their life on land • Lay their eggs on land • Lizards, snakes, turtles, and crocodiles are examples. Birds • Have wings and beaks • Are the only animals that have feathers • Lay eggs with shells • Use their wings to fly Mammals • Have fur or hair • Give birth to live babies • Have only a few babies at a time • The female feeds the young milk from her body • The young are taken care of for a long time • Humans, dogs, horses, cows are mammals.
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